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The Live CB240B Double Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide comprehensive protection for very high-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors. Rated at 40 Amps with a B-curve tripping characteristic, this 2-pole breaker safeguards both the phase and neutral conductors on AC systems up to 230/400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with high prospective short-circuit currents near main distribution points. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CB240B ensures complete circuit isolation and equipment protection for demanding commercial and industrial applications requiring double pole switching for high-current circuits.
Complete Double Pole Protection: Simultaneously protects and switches both phase and neutral conductors, ensuring complete circuit isolation during fault conditions and maintenance.
High 10kA Breaking Capacity: Powerful fault current interruption for installations with high prospective short-circuit currents up to 10,000 amps.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (120A to 200A), specifically calibrated for very high-power resistive loads with minimal inrush.
Very High-Capacity 40A Protection: Ideal for large commercial cookers (9kW+), industrial water heaters, high-power catering equipment, and main distribution feeders.
Complete Isolation: Neutral pole disconnects simultaneously with phase, preventing floating neutral conditions and ensuring safety during maintenance.
Commercial & Industrial Rating: 40A suits demanding applications in large restaurants, industrial canteens, hotels, and light industrial settings.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on both poles.
Superior Electrical Isolation: 4000V impulse withstand rating and 500V insulation voltage for protection against voltage transients.
Extended Operational Life: 8,000 electrical operations for long-term reliability.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CB |
| Model Number | CB240B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| Current Rating (In) | 40 Amperes |
| Trip Curve Type | B Curve (3-5 × In) |
| Operational Voltage | 230/400V AC |
| Rated Breaking Capacity | 10kA (10000 Amps) |
| Frequency Range | 50/60 Hertz |
| Insulation Rating (Ui) | 500 Volts |
| Impulse Withstand (Uimp) | 4000 Volts (1.2/50 µs) |
| Dielectric Test Voltage | 2kV for 60 seconds |
| Protection Mechanism | Thermo-magnetic (both poles) |
| Neutral Pole Protection | Fully protected and switched |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 40A double pole MCB with B-Curve?
Large commercial cookers and ranges (9-9.5kW), industrial water heaters, high-power catering equipment (large fryers, boilers), main distribution feeders for commercial units, and large-scale resistive heating systems.
2. Can this 40A double pole breaker support a 9kW commercial range?
Yes, a 9kW commercial range at 230V draws approximately 39.1A, making this 40A breaker ideally sized. Double pole ensures both phase and neutral are disconnected for safety during equipment servicing.
3. What is the power capacity of this 40A double pole breaker?
Maximum resistive load: 9.2kW at 230V. Continuous load (80% rule): 7.36kW. Ideal for large commercial cooking appliances and high-power industrial resistive loads requiring complete isolation.
4. Why choose double pole for main distribution feeders?
Double pole provides complete isolation of both phase and neutral at the distribution point, essential for safe maintenance of downstream circuits and compliance with electrical regulations for commercial installations.
5. What cable size is mandatory for 40A double pole circuits?
10mm² copper conductor minimum. 16mm² recommended for longer runs or high ambient temperatures. Terminals accept up to 16mm² directly. Both phase and neutral conductors must be same size.
